It's stylish to place an low-profile yet charming logo in some corner of your
slides. Here we use the pgf package to accomplish this.
\usepackage{pgf}
\logo{\pgfputat{\pgfxy(9.45,1.5)}{\pgfbox[center,base]{\includegraphics[width=1.7cm]{logo.png}}}}
You probably need to tweak the coordinates a little bit to fit the logo to your slides.
Also, to hide logo and also page number on title page, you'll need to this.
\begin{document}
{
% no page #, no logo on title page
\setbeamertemplate{footline}{}
\setbeamertemplate{logo}{}
\begin{frame}
\titlepage
\end{frame}
}
% other frames
\end{document}
Here is how they look like.
